Introduction to the technology and basic component

2022-08-06
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The color masterbatch is composed of an excess of chemical additives, carrier resins and dispersants. Color masterbatch is an aggregate obtained by uniformly attaching super constant pigments (dyes) to resin to enhance the ability to deal with trade protectionism. The color masterbatch is mainly composed of pigment, dispersant and carrier resin

color masterbatch was first developed by Western European countries in the 1960s, and the research in this field started late in China. At the end of the 1970s, Beijing, Shanghai and Tianjin began to develop and test produce; In the mid-1980s, Beijing Yanshan Petrochemical and Guangdong Xinhui successively introduced wet and dry process technologies and equipment from Ciba geigy, Hoechst and other companies, and China's Color Masterbatch industry entered a period of rapid growth

the technical requirements for color masterbatch are very strict, and the generally used color masterbatch technology is a wet process. The color masterbatch is made by water phase grinding, phase transformation, water washing, drying and granulation. Only in this way can the product quality be guaranteed. In addition, while grinding the pigment, a series of Color Masterbatch technical tests shall be carried out, such as determining the fineness of the sanding slurry, determining the diffusion performance of the sanding slurry, determining the solid content of the sanding slurry and determining the fineness of the color slurry

what is color masterbatch? Why use color masterbatch

Color Masterbatch, also known as color seed, is an aggregate made by uniformly attaching super constant pigments or dyes to resins

several advantages of using color masterbatch:

1 It is beneficial to maintain the chemical stability and color stability of pigments

2. Make pigments have better dispersibility in plastics

3. Protect the health of operators

4. Simple process and easy color transfer

5. The environment is clean and does not contaminate the utensils

6. Save time and raw materials

due to the direct contact of pigments with the air during storage and use, moisture absorption, oxidation, agglomeration and other phenomena will occur. Direct use will cause color spots on the surface of plastic products, which will darken the color, fade easily, and cause dust during mixing, affecting the health of operators. During the production process, the color masterbatch is mechanically processed to refine the pigment, fully mix the pigment with resin carrier and dispersant, and isolate the pigment from air and moisture, so as to enhance the weatherability of the pigment, improve the dispersion and coloring power of the pigment, and make the color bright. Because the shape of color masterbatch is similar to that of resin particles, it is more convenient and accurate in measurement, and will not adhere to the container during mixing. Therefore, it saves too long of preliminary research and demonstration to conceive the innovative idea of R & D, including the time for cleaning containers and machines and the raw materials used for cleaning

basic components of color masterbatch

1 Pigments or dyes

pigments are divided into organic pigments and inorganic pigments

common organic pigments include phthalocyanine red, phthalocyanine blue, phthalocyanine green, sun resistant scarlet, macromolecular red, macromolecular yellow, YONGGU yellow, YONGGU purple, azo red, etc

common inorganic pigments include cadmium red, cadmium yellow, titanium dioxide, carbon black, iron oxide red, iron oxide yellow, etc

comparison of three major pigments

project dyestuff organic pigments inorganic pigments

natural and synthetic sources natural or synthetic

in transparent plastics, a few are translucent when the concentration is low, and can not be transparent

large and medium and small coloring concentration

large and medium and small brightness

poor light stability, medium and strong

large and medium and small migration phenomenon

2 Carrier

carrier is the matrix of color masterbatch. The special color masterbatch generally selects the same resin as the product resin as the carrier. The compatibility between the two is the best, but the fluidity of the carrier should also be considered

3. Dispersant

dispersant makes the pigment disperse uniformly and no longer agglomerate. The melting point of dispersant should be lower than that of resin, which has good compatibility with resin and good affinity with pigment. The most commonly used dispersants are polyethylene low molecular wax and stearate

4. Additives

such as flame retardant, brightening, antibacterial, antistatic, antioxidant and other varieties, unless required by the customer, the color masterbatch generally does not contain the above additives

variety and grade of color masterbatch

the common classification methods of color masterbatch are as follows:

classification by carrier: such as PE Color Masterbatch, PP Color Masterbatch, ABS Color Masterbatch, PVC color masterbatch, EVA Color Masterbatch, etc

classification by use: such as injection masterbatch, blow molding masterbatch, spinning masterbatch, etc

each variety can be divided into different grades, such as:

1 Advanced color masterbatch for injection

is used for cosmetic packaging boxes, toys, electrical enclosures and other high-grade products

2. Common injection Color Masterbatch

is used for general daily plastic products, industrial containers, etc

3. Advanced blown film color masterbatch

is used for blow molding coloring of ultra-thin products

4. Common blown film color masterbatch

is used for blow molding coloring of general packaging bags and woven bags

5. Spinning masterbatch

is used for spinning coloring of textile fibers. The masterbatch pigment has fine particles, high concentration, strong coloring power, and good heat and light resistance

6. Low grade color masterbatch

is used to manufacture low-grade products with low requirements for color quality, such as garbage cans, low-grade containers, etc

use and precautions of color masterbatch

the use of color masterbatch is very simple, as long as it is fully mixed with plastic resin according to a certain proportion, In coordination with various kinds of problems, Slater told the reporter on the website of American fast company magazine: "Most plastic wastes still meet the same plastic processing process requirements, and can be extruded.

it should be noted that when changing colors, the hopper must be cleaned, the residual materials in the machine barrel must be washed with primary color plastic or screw cleaner, and replaced with a new filter. It is better to use more than 100 mesh filter; pay attention to whether the temperature is correct to prevent color changes.

the impact of the use of color masterbatch on the product cost Ring

in most cases. However, in some cases, the use of color masterbatch is more economical than the use of toner, because colorists can achieve the coloring effect of higher price pigments through the combination of several lower price pigments

the following two phenomena should also be considered:

1 In many cases, the pigments used by plastic product manufacturers in color matching with toner are not the most economical. However, due to the lack of familiarity with pigments, repeated experiments in color matching cause a waste of manpower and materials. There is no such problem when using color masterbatch

2. The grade of products colored with color masterbatch is completely different from that colored with toner, and the price is also higher. The higher price is often higher than the increased cost of using color masterbatch, so color masterbatch can create "profits"

from this point of view, in some cases, the use of Color Masterbatch coloring is more "economical" than the use of toner coloring

common problems and treatment methods when coloring plastic products

1. product surface graining:

main reasons: ① impurities in the barrel and die head; ② Incorrect temperature; ③ The raw material is heated in the barrel for too long; ④ Dispersity of Color Masterbatch or toner is not treated well; ⑤ Filter is perforated

treatment method: adjust the temperature of the plasticizer to be lower than the normal temperature ℃, start the plasticizer, use the primary color plastic resin to have strong data and graphics processing function at the slowest speed, and print out the complete experimental report and experimental curve in real time for cleaning. If necessary, disassemble the mold head for cleaning, adjust the temperature, and replace the filter in time. Use a well dispersed Color Masterbatch or toner for debugging

2. uneven diffusion:

main reasons: ① uneven mixing; ② Improper temperature; ③ Poor compatibility between color masterbatch and raw materials; ④ The plasticizing effect of the plasticizer itself is poor; ⑤ The proportion of color masterbatch is too small

treatment method: fully stir, adjust the temperature properly, replace the color masterbatch or raw materials, replace other machines for production, and adjust the proportion of color masterbatch

3. frequent cutting

main reasons: ① incorrect temperature; ② Poor compatibility of raw materials; ③ Poor dispersion of color masterbatch; ④ The proportion of color masterbatch is too high

treatment method: adjust the temperature accurately, replace the raw materials used, replace the masterbatch with excellent dispersion, and reduce the use proportion of masterbatch

4. color changes:

main reasons: ① the background color of raw materials used is inconsistent; ② The plasticizer is not clean; ③ The color masterbatch or toner used has low temperature resistance, and will fade when the temperature is too high; ④ The blanking door is not clean; ⑤ Change of processing technology; ⑥ Color Masterbatch or toner has color difference; ⑦ Improper matching of nozzle materials; ⑧ The mixer is not clean or the mixing time is not well controlled

treatment method: use the raw materials with the same color as that of the striking plate and adjust the matching proportion of nozzle materials; Thoroughly clean the plastic machine, blanking door and mixer; Use color masterbatch or toner with appropriate temperature resistance and consistent color; Use stable processing technology

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